Recent content by GalileosTelescope

While I admit I was maybe a bit too loose with my language, I think your disagreement with me is mostly a matter of linguistic preferences and semantics. I think I would say I'm falling towards tomorrow. It's got a nice poetic ring to it. I'm certainly not falling towards yesterday. How can...

I suppose I wasn't clear enough. Yes the schwarzchild radial direction becomes a time coordinate, in the sense that it gets the negative sign in the spacetime interval. So like many have said, falling towards the singularity is a time location in that sense. But ultimately what the original...

Yeah I figured as much. Thanks!

Very interesting question. I don't think this will fully answer it, but here is a little thought experiment. Before the black holes merge, the math says an observer inside one of the holes, cannot move in the outward radial direction, only towards the singularity. This is because according...

Hi all, I just joined. Just looking for interesting physics problems and incites. I'm in the process of creating a youtube physics channel, so if anyone has any fun problem ideas, let me know

Yeah the main point was that the definition of the "edge of the galaxy" is not clear. Is it defined by the edge of photon emitting matter or some sort of gravitational edge? What we can say is that the size of a galaxy is somewhere between those to definitions.

It depends on if you define the size of a galaxy by the volume of normal matter or the dark matter halo. The typical volume of a galaxy by normal matter is ~10^12 ly^3. If you include the DM halo it's a million times larger. The total number of galaxies in the observable universe is ~10^12...